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# can someone clarify this? Probability of selecting student

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Manager
Joined: 03 Jul 2006
Posts: 179
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can someone clarify this? Probability of selecting student [#permalink]  12 Aug 2006, 06:23
can someone clarify this?

Probability of selecting student from senior class 60/1000 ==> CORRECT

but it also says,
the probability of selecting a member of the pair from junior class is 1/800.
Isn't it 60/800 ?
Senior Manager
Joined: 14 Jul 2005
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Kudos [?]: 12 [0], given: 0

Hi rkatl

The prob for selecting a senior from the class is number of senior siblings/ total number of students, hence 60/1000.

The second probability is 1/800 because the total set of juniors is 800 and there is only 1 matching sibling for the senior you have selected (although just selecting any sibling would be 60/800)
Manager
Joined: 03 Jul 2006
Posts: 179
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Kudos [?]: 8 [0], given: 0

got it.. thanks, gmatornot
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# can someone clarify this? Probability of selecting student

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